Click on "additions" in the top menu and "Add Marker - Simple". The more detailed the location you type in, the closer to your location the pin wiill drop. It can be relocated, if necessary, by clicking on your pin and using the 2d icon at the bottom right of the "pin info" block.

I've added my pin to get us started. I'm going to have my iPad at the MEM table. We'll watch for pins to appear.